Notes

Specifics You Have To Have Knowledge Of Blu-Ray Technology



Yes, it's ray not the blue-ray. The letter 'e' was intentionally avoided to restore suitable for trademarking. And yes, the Blu-ray is more advanced and much better when compared to a DVD. Every one was very excited when DVDs launched in 1997 making it possible playing digital audio/video even just in our houses. Now, individuals are referring to the new technology which can be even finer quality than DVDs that came into existence in 2006.





After VCR's and DVDs, advances in technology brought us Blu-ray technology. The name blu-ray is derived from the fact that a blue (actually blue-violet) laser is employed for reading and writing Blu disc.ray technology is no achievement of the single company. A group of prominent manufacturers like Apple, Dell, Sony, Sun Microsystems etc formed ray Disc Association which developed this technology.

Blu-ray discs can beat DVDs from the following factors:

(a) More storage capacity A single-sided standard 12 cm DVD can store 4.7 GB of knowledge whereas the same size single layer ray disc can store 25 GB of data that is almost more greater than a DVD. A dual layer ray disc can store 50 GB of information. Much like DVDs we could get mini size ray discs also with the height and width of 8 cm. This mini disc with single layer capacity can store 7.8 GB and dual layer capacity can store 15.6 GB.
(b) Higher data rate of 36 Mbps and,
(c) Audio and video are used more clarity compared to DVD.

The following are the standards which are responsible to embed more data right into a ray disc:

(a) Contrary to DVDs which depend on red lasers operating at 650 nm to read and writing data, Blu-ray discs rely on blue laser that operates at 405 nm. Since the ray technology is with all the short wavelength laser when compared with DVD, it might embed more data to the disc which has precisely the same size a DVD.
(b) The thickness of canopy layer was decreased.
(c) Numerical aperture was increased to 0.85.

Different formats of ray disc:

(a) BD-R: Recordable format for HD video recording and PC data storage.
(b) BD-ROM: Read only format for pre-recorded contents like hi-def movies, games.
(c) BD-RW: Rewritable format for PC data storage.
(d) BD-RE: Rewritable format for HD videos and PC data storage.

The exclusive features of Blu-ray players are:

*You can create the playlists.
*You could make changes for the recorded video and shuffle their order.
*You can record high-definition television (HDTV) with improved sound and picture qualities.
*You can record a plan while playing one more.
*The player automatically pursuit of the empty space to record new programs about the disc in order to avoid overlapping of programs.
*You can randomly go to any point on the disc.


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